Fixing Localhost SSL Connection Error in Google Chrome

Google Chrome Error Message

The details read: “Unable to make a secure connection to the server. This may be a problem with the server, or it may be requiring a client authentication certificate that you don’t have.” You load localhost in Firefox, Edge, IE, Safari, and the page loads fine. What gives?

Before you start googling “client authentication certificate” or “localhost doesn’t work on Chrome” or “chrome NET::ERR_CERT_AUTHORITY_INVALID localhost” (like I did) take a look at the URL Chrome is trying to access. Is it HTTP or HTTPS?

If you’re like me, it will be HTTPS. And every time you try and load the non-secure, HTTP URL, Chrome re-directs you to the secure, HTTPS URL. The problem might be your localhost isn’t running on a secure version of the hyper text transfer protocol. That’s why when you type in http://localhost:8080 in Firefox or Edge or Safari your page loads fine. Those web browsers aren’t re-directing you. HTTP Strict Transport Security (HSTS) is an established standard for all major web browsers, but as of now, at least for me, only Google Chrome has it enabled by default.

So how do we get around this issue? To fix, try this: go to chrome://net-internals, select “HSTS” from the drop down, enter localhost under “Delete domain” and press the Delete button.

Note, this is a temporary fix. As soon as you visit localhost over HTTPS again it’ll be included in this HSTS list again and you’ll start seeing that SSL connection error message again.

If you have an easy, permanent solution to this issue, I’d love to hear about it. I read about some fixes requiring edits to web server conf files. But if you’re lazy like me, or not really sure which line in which conf file should be edited, try this solution first. I hope it saves someone out there a couple hours’ worth of frustration troubleshooting the issue.

For the record, I think “encryption by default” is a great thing and appreciate web browsers moving in that direction with search queries and how content is loaded. But it can sure cause some puzzling issues when it comes to local web development. I encourage you to learn more about HSTS from owasp.org or better yet from Google’s Chromium Projects site.

I ran into this issue trying to run a Java web app on a computer I hadn’t run it on for a while, a computer that I’d just loaded Windows 10 on. I ran into a bunch of issues getting my dev environment back up and running, including having to re-install Apache, services hogging the 8080 port, environment variables no longer matching their values, etc. Oh, the joy! I’ll definitely be posting more on how I worked through those issues in the future.



12 responses to “Fixing Localhost SSL Connection Error in Google Chrome”

  1. Tuyen Nguyen says:

    Thank you, it works for me.

  2. neilos says:

    Clearing the history (chrome://history/) with all options ticked worked for me.

  3. spritCrusher93 says:

    definitely worked for me.thanks.man !

  4. Chris says:

    Thank you for this!

  5. Shaimoom Newaz says:

    That combined with clear cache worked well.

  6. Thank you for this. Along with clearing the cache, this made the https go away for localhost. I appreciate the tip. It was a frustrating 5 minutes of wondering WTF lol.

  7. Martijn says:

    Going to: chrome://net-internals/ but where can I delete the entries?
    It is SOOOO frustrating.

    I already tried to clear the cache. No luck.

  8. Chase Woodford says:

    Looks like Chrome changed the interface a bit in recent update. If you’re having trouble finding the HSTS bit, try chrome://net-internals/#hsts and look at very bottom for ‘Delete domain security policies’ section.

  9. Sh4man says:

    Many thanks.
    Just one thing :
    HSTS off = MiTM SSLstrip attack possible, so first check you have no hacker on your network.

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